June 16 (Reuters) - U.S. stocks rose on Tuesday following
back-to-back daily declines, with merger activity more than
offsetting market concerns as Greece struggles to avoid a
default on its debt.

Traders also kept an eye on interest rates as a two-day
policy-setting meeting at the Federal Reserve got under way.

Despite the collapse of talks between Athens and its
European and IMF lenders over the weekend, Greek Prime Minister
Alexis Tsipras told U.S. Treasury Secretary Jack Lew that Athens
aimed to reach a deal. Lew said failure to reach an agreement
would create broad uncertainties for the global economy.

"The market seems to be pricing in a possibility,
overpricing, a Greece exit," said Art Hogan, chief market
strategist at Wunderlich Securities in New York.

He said he does not expect a surprise to the market from the
Fed in terms of a rate hike, or from a Greek default.
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